*
* Licensed under the GPL v2, see the file LICENSE in this tarball.
*/
-
#include "libbb.h"
/* This is a NOFORK applet. Be very careful! */
-
-int seq_main(int argc, char **argv);
+int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int seq_main(int argc, char **argv)
{
- double last, increment, i;
+ enum {
+ OPT_w = (1 << 0),
+ OPT_s = (1 << 1),
+ };
+ double first, last, increment, v;
+ unsigned n;
+ unsigned width;
+ unsigned frac_part;
+ const char *sep, *opt_s = "\n";
+ unsigned opt;
+
+#if ENABLE_LOCALE_SUPPORT
+ /* Undo busybox.c: on input, we want to use dot
+ * as fractional separator, regardless of current locale */
+ setlocale(LC_NUMERIC, "C");
+#endif
- i = increment = 1;
+ opt = getopt32(argv, "+ws:", &opt_s);
+ argc -= optind;
+ argv += optind;
+ first = increment = 1;
+ errno = 0;
switch (argc) {
- case 4:
- increment = atof(argv[2]);
+ char *pp;
case 3:
- i = atof(argv[1]);
+ increment = strtod(argv[1], &pp);
+ errno |= *pp;
case 2:
- last = atof(argv[argc-1]);
- break;
+ first = strtod(argv[0], &pp);
+ errno |= *pp;
+ case 1:
+ last = strtod(argv[argc-1], &pp);
+ if (!errno && *pp == '\0')
+ break;
default:
bb_show_usage();
}
- /* You should note that this is pos-5.0.91 semantics, -- FK. */
- while ((increment > 0 && i <= last) || (increment < 0 && i >= last)) {
- printf("%g\n", i);
- i += increment;
+#if ENABLE_LOCALE_SUPPORT
+ setlocale(LC_NUMERIC, "");
+#endif
+
+ /* Last checked to be compatible with: coreutils-6.10 */
+ width = 0;
+ frac_part = 0;
+ while (1) {
+ char *dot = strchrnul(*argv, '.');
+ int w = (dot - *argv);
+ int f = strlen(dot);
+ if (width < w)
+ width = w;
+ argv++;
+ if (!*argv)
+ break;
+ /* Why do the above _before_ frac check below?
+ * Try "seq 1 2.0" and "seq 1.0 2.0":
+ * coreutils never pay attention to the number
+ * of fractional digits in last arg. */
+ if (frac_part < f)
+ frac_part = f;
+ }
+ if (frac_part) {
+ frac_part--;
+ if (frac_part)
+ width += frac_part + 1;
+ }
+ if (!(opt & OPT_w))
+ width = 0;
+
+ sep = "";
+ v = first;
+ n = 0;
+ while (increment >= 0 ? v <= last : v >= last) {
+ printf("%s%0*.*f", sep, width, frac_part, v);
+ sep = opt_s;
+ /* v += increment; - would accumulate floating point errors */
+ n++;
+ v = first + n * increment;
}
+ if (n) /* if while loop executed at least once */
+ bb_putchar('\n');
return fflush(stdout);
}